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US 2013/0154161 A1Published application
Method and apparatus associated with anisotropic shrink in sintered ceramic items
AssigneeROLLS-ROYCE plc
InventorsM. Eric Schlienger, Nina Bergan French, Michael D. Baldwin, Michael Maguire, Paul Withey
Life of this patent
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Abstract
A manufacturing method for producing ceramic item from a photocurable ceramic filled material by stereolithography. The method compensates for the anisotropic shrinkage of the item during firing to produce a dimensionally accurate item.
Claims21
-56. (canceled)
A method, comprising:
- representing an item including its dimensions relative to a three dimensional coordinate system, the item adapted to be formed as a green ceramic item in a stereolithography apparatus from a photo-polymerizable material including ceramic particles;
- applying three unequal scaling factors to the dimensions to compensate for the anisotropic shrinkage of the green ceramic item relative to the axes of the coordinate system upon the green ceramic item being sintered;
- building the green ceramic item in the stereolithography apparatus after said applying;
- and
- heating the green ceramic item to form a sintered ceramic item substantially conforming to the dimensions.
2 more elements
A method, comprising:
- defining the original dimensions of an item with reference to a three dimensional coordinate system associated with a stereolithography apparatus, the coordinate system including a first direction, a second direction, and a third direction;
- applying a first factor to increase the original dimensions of the item defined relative to the first direction;
- applying a second factor to increase the original dimensions of the item defined relative to the second direction;
- applying a third factor to increase the original dimensions of the item defined relative to the third direction;
- wherein the third direction corresponds to a build direction, and wherein the factors are not equal;
- building a green ceramic item by stereolithography from a photo-polymerizable resin including ceramic particles, said building utilizing the increased dimensions from said applying acts to control the dimensions of the green ceramic item;
- and
- sintering the green ceramic item to form a sintered ceramic item, wherein the sintered ceramic item has dimensions corresponding substantially to the original dimensions of the item.
5 more elements
Dependencies are inferred from the claim text.